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| Q. |
Open-end classes are those in which |
| A. | lower limit of the first class and the upper limit of the last class are known |
| B. | lower limit of the first class and the upper limit of the last class are not known |
| C. | only lower limit of the first class are known |
| D. | none of the above |
| Answer» A. lower limit of the first class and the upper limit of the last class are known | |
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